<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            height: 1000px;
            width: 600px;
            display: flex;
            margin: auto;
            flex-direction: row-reverse;
            
        }
      .d1{
        height: 200px;
        width: 200px;
        background-color: lightblue;
        display: flex;
      }
      .d2{
        height: 200px;
        width: 200px;
        background-color: lightgreen;
        
      }
      .d3{
        height: 200px;
        width: 200px;
        background-color: lightpink;
        
      }
    </style>
</head>
<body>
        <div class="box">
            <div class="d1">1</div>
            <div class="d2">2</div>
            <div class="d3">3</div>
        </div>
        
    
    
</body>
</html>